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    Question

    A train travelling at a speed of 80 km/h, takes 27

    seconds to cross a pole. If the train increased its speed by 10 km/h, how long would it take to cross a 150-metre-long platform?
    A 35 seconds Correct Answer Incorrect Answer
    B 30 seconds Correct Answer Incorrect Answer
    C 26 seconds Correct Answer Incorrect Answer
    D 32 seconds Correct Answer Incorrect Answer

    Solution

    80 km/h = 80 X (5/18) = (200/9) m/s So, length of the train = (200/9) X 27 = 600 metres Increased speed of the train = 80 + 10 = 90 km/h = 90 X (5/18) = 25 m/s So, time taken to cross a 150-metre-long platform = (600 + 150) ÷ 25 = 30 seconds

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